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Sahay Sir > Question Answers > MTG NEET Physics > Part 2 > Chapter 9 - Ray Optics > A diverging beam of light from a point source S having divergence angle α, falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and the refractive index u, then the divergence angle of the emergent beam is:

A diverging beam of light from a point source S having divergence angle α, falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and the refractive index u, then the divergence angle of the emergent beam is:

A diverging beam of light from a point source S having divergence angle α falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and the refractive index u then the divergence angle of the emergent beam is: